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/*
* src/pwm.c
* (c) 2022 Jonas Gunz <himself@jonasgunz.de>
* License: All rights reserved.
*/
#include "pwm.h"
uint8_t t0_ovf_cnt = 0;
uint8_t pb0_thresh = 128;
ISR(TIMER0_OVF_vect) {
cli();
/*TCNT0 = (1<<7);*/ /* Hack-increase Interrupt trigger freq */
t0_ovf_cnt ++;
if ( t0_ovf_cnt >= pb0_thresh )
PORTB &= ~(1<<PINB0);
else
PORTB |= (1<<PINB0);
sei();
}
ISR(TIMER2_OVF_vect) {
cli();
pb0_thresh ++;
sei();
}
void pwm_init() {
/* Pins */
DDRB |= (1<<PINB0);
/* Enable TIMER0 with interrupt, no prescaler */
TCCR0 |= (1<<CS00);
TIMSK |= (1<<TOIE0);
/* Enable TIMER2 with interrupt, Clk divide by 1024 */
/*
TCCR2 |= (7<<CS20);
TIMSK |= (1<<TOIE2);
*/
}
void pwm_set_pin(uint8_t _pin, uint8_t _duty) {
if(_pin == 0)
pb0_thresh = _duty;
}
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